Any player who has watched a nature documentary knows that hippos are dangerous. But it’s nice to have the statistics to deliver the message home to cocky PCs as well.
Most elves revere graceful creatures: deer, unicorns, cranes, kites, and the like. However, the mysterious wooden-masked elves of the Pel Menj jungles hold hippos in special reverences, with crescent moon-marked behemoth specimens guarding their most sacred temples.
A hippopotamus-filled river is the only thing keeping a village safe from goblin marauders on the opposite bank. When a magical disease strikes the hippos, the entire village is at risk.
During the rainy season, flooding deltas cause the territories of fresh and saltwater creatures to overlap. Travelers report of titanic struggles between behemoth hippopotami and tylosauruses—the marine lizards are longer, but the river horses’ bulk usually tells in the end.
—Pathfinder Bestiary 2 157